Water-tube boiler.



J. P. SNEDDON.

WATER TUBE BOILER.

APPLIGATION FILED 33.25, 1907.

941,8QQD Patented. Nov. 30, 1909.

2 SHEETSSHEET l WITNESSES INVENTOF.

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Law 5w @5 I. P. SNEDDON.

WATER TUBE BOILER.

APPLICATION FILED r2325, 1907.

Patented Nov. 30, 1909.

QQLSQQE 2 SHEETS-SHEET 2.

INVENTOR WITNESSES.

UNITED STATES PATENT OFFICE.

JAMES P. SNEDDON', OF BARBERTON OHIO, ASSIGNOR TO THE BABCOCK &' WILGOX COMPANY, OF NEW YORK, N. Y., A CORPORATION OF NEW JERSEY.

WATER-TUBE BOILER.

Specification of Letters Patent.

Patented Nov. 30, 1909.

To all whom it may concern:

Be it known that I, JAMES P. SNEDDON, of llarberton, Summit county, Ohio, have invented a new and useful ater Tube Boiler, of which the following is a full, clear, and exact description, reference being had to the accompanying drawings, forming partof this. specification, in 'which Figure 1 is a sectional side elevation showing one form of my improved boiler; and Fig. 2 is a front elevation of the same onehalf in section.

My invention relates to the class of vertical water tube boilers built in large units and is designed to provide an improved boiler which is fired at both ends.

A further object of the invention is to protect the mud drums of such a boiler from the direct action of the flame and gases, to con'ibinea superheatcr or superheaters with such type of boiler, and to give a compact structure of large heating surface.

In the drawings, 2, 3 and 4 represent steam and water drums, of which the central drum 2 is preferably of larger capacity than the front and rear drums 3 and t. These drums extend transversely of the setting, and below them I provide two mud drums 5 and 6, also parallel and transverse to the setting, and placed near each other between the bridge walls 7. The mud drums are preferably connected by tubes or nipples 8, and the drums (3 connected with drum 2. by a bank of tubes 9 and with drum 4t by a bank of tubes 10.. Correspondingly mud drum 5 is connected with central drum 2 by a bank of tubes 11 and with drum .3 by a bank of tubes l3 and H are the front and rear walls of the setting, from which extend the tiring openings leading to the opposite coinbustion chambers 15 having grates 16. These combustion chambers are preferably separated from each other by the bridge walls and extend across the setting and below the inclined banks of tubes 10 and 12. Battles 17 extend along the rear portions of the tubes 10 and 12, and depending battles 18 extend downwardly between the tubes 9 and 10 and the tubes 10 and 12 respectively, in the form shown. This pro vides a space between the two batlles 17 ard 18, in which triangular space I locate two superheaters in the second passes of the gases over the two furnaces. These superheaters may be of any desirable type, and I have shown them as having upper and lower drums 19 and 20 connected by superheating tubes 21. The upper drums 12) are connected by steam inlet pipes 22 with the drum 2, and by steam inlet pipes 23' with the drums 3 and 4. These inlet tubes extend along nearly one- -half of the drums 19, these drums having central partition plates 24 which give an up and down pass to the steam. The steam outlets 25 are in thejppposite upper chambers of the drums 19-; and the stack outlets 26 are preferably between the drum 2 and the drums 19. The lower drums of the superheater are preferably provided with the flooding connections consisting of pipes 27 leading from the water spaces of the steam and water drums 3 and 4c. The drums 3 and 4 are preferably connected with the drum 2 by direct water circulators 28, which are staggered relatively to the superheater tubes and extend between them.

In the operation of the boiler, the flame and products of combustion rise from the combustion chambers 15 among the opposite bank of tubes 10 and 12. They then flow inwardly toward each other and down among the super-heater tubes to the lower ends of the ballles 18, whence they arise among the sets of tubes 9 and 11 anddivide and pass to the outlets 26. The steam generated in the three steam and water drums passes to the snperheater, and thence to the outlet in the ordinary manner.

The advantages of my invention result from the compactness, and large heating surface obtained by the peculiarconstruction of the two-furnace boiler. The mud drums are protected and separate the two furnaces, giving an open space between the furnaces for entrance. The super-heaters are symmetrically located and receive the heat from two different furnaces, while belonging to the same boilcr andlocatcd in the single boiler structure.

The number of upper and lower drums may be varied, the tubes in the several banks may be vertical or inclined, the superheater structure maybe used or not as desired, and many other changes may be made in the form and arrangement of the parts without departing from my invention,

I claim 1. A vertical water tube boiler having firing openings at opposite ends, a pairof mud drums adjacent the firing openings,

bridge walls protecting said mud drums, a

connecting the mud, drums to the central steam drum, bafiies arranged between the banks of tubes and serving to direct the products of combustion from both ends towa't'd the double bank of tubes and the central steam drum, superheaters arran ed between the outer and double banks of tubes, and circulating connections between the superheaters and the steam drums, substantially as described.

2. A vertical water tube boiler having firing openings at both ends, steam drums having a common water level, mud drums arranged adjacent the firing openings, banks of tubes forming circulating connections between the several drums, and bafiies arranged to direct the products of combustion toward the central portion of the boiler, substantially as described.

3. A vertical water tube boiler having opposite'furnaces, mud drums arranged adjacent the firing openings of said furnaces and in comnnmication with each other, a plurality of steam drums having a common water level, outer banks of tubes connecting the mud drums with the onterlnost steam drums, a duplex bank of tubes forming-a connection between both mud drums and the central steam drum, baflies for directing the products of combustion to an intermingling point at the center of the boiler, and circulating connections between the several steam drums, substantially as described.

4.'A vertical water tube boiler having firing openings in both ends, a pair of mud drums arranged'adjacent the firing opening and in communication with each other, refractory material protecting said mud drums, a series of steam drums, outer inclined banks of tubes forming a circulating connection between the mud drums and the outermost steam drains, a duplex bank of tubes connecting the mud drums with the central steam drum, circulating connections between, the several steam drums, superheaters arranged between the several banks of tubes and in direct line of the path of the products of combustion, and bafiies arranged to direct the gases from both ends of the boiler toward a common central intermingling point, substantially as'described.

5. In a vertical water tube boiler, a pair of furnaces arranged at the opposite ends of the boiler, a pair of mud drums adjacent the furnaces, a series of steam drums having a common water level, outer inclined banks of tubes -connecti gnthe mud drums with the outermost steam drums, a duplex bank of ranged at the upper portion of the boiler and having a common water level, outer inclined banks of tubes connecting the mud drums with the outermost steam drums and arranged in the direct course of the products of combustion, a duplex bank of tubes forming a circulating connection between the mud drums and the central steam drum, battle plates for directing the course of the products of combustion from both furnaces toward the central portion of the boiler, superheaters arranged between the battle plates, and steam connections between the several steam drums and the superheaters,

substantially as described.

7. In a vertical water tube boiler, a pair of furnaces arranged at opposite ends of the boiler, a pair of horizontallydisposed mud drums adjacent the furnaces, a central and a pair of outer steam drums arranged at the upper portion of said boiler, outer inclined banks of tubes forming a circulating con nection between the mud drums and the outer steam drums, a duplex bank of tubes connecting the mud drums with the central steam drum, batile plates arranged to direct the course of the products of combustion into contact with the duplex bank of tubes,

' a pair of escape flues arranged on opposite sides of the central steam drum, a pair of superheaters arranged between the baflies,

-water circulating connections between the several steam drums, and steam connections between the steam drums and the superheaters.

In testimony whereof, I have hereunto set myhand.

. JAMES P. SNEDDON. Witnesses:

A. H. KInKnAUn, J. FRANK. 

